Topology Exploration and Torque Component Analysis of Double Stator Biased Flux Machines Based on Magnetic Field Modulation Mechanism

Sheng, Tiantian; Niu, Shuangxia; Fu, Weinong; Lin, Qifang

doi:10.1109/tec.2017.2759815

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…References [24]- [26] given in the introduction do not match with the two-stator-slot-pitch DC coil machine, as these references are about PM machines?…”

Section: Reviewer's Commentmentioning

confidence: 99%

“…VRMs with DC coils across two stator teeth is an emerging non-PM candidate. Compared to DF-DSM, it has symmetrical magnetic circuit and sinusoidal back EMF, which contributes to reduced torque ripple [24][25][26]. Compared to the traditional VRMs using full DC coils, it shows comparable torque density but with reduced DC coils and the associated DC copper loss.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Winding Switching Control Strategy of a Consequent-Pole Ferrite-PM Hybrid-Excited Machine for Electric Vehicle Application

et al. 2022

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Vernier reluctance machine (VRM) with DC field coils in stator is a competitive rare-earth-free design for variable-speed industrial applications due to its robust structure and controllable excitation, while its torque density is relatively disadvantageous. To address this issue, this paper proposes a new armature winding design method for VRM with DC field coils across two stator teeth.The key is to break the traditional winding design principle based on the flux modulation effect of fundamental DC field harmonic, and instead, reconstruct a novel harmonic winding to enhance the utilization factor of the modulated high-order DC field harmonics arising from the unique magnetomotive force distribution of DC field coils across two stator teeth. By this means, the torque density can be improved by 75.6% compared to the existing counterpart. In this paper, the machine structure and operation principle are introduced, with emphasis on the high-order DC field harmonics distribution rule and its influence on the armature winding design. By finite element design and optimization, a comparative study is performed to evaluate the electromagnetic performance of VRMs using two different winding configurations with variable slot pole combinations. A prototype is fabricated and tested, and the results agree well with finite element analysis, which verifies the feasibility and advantages of the proposed winding design method.

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“…References [24]- [26] given in the introduction do not match with the two-stator-slot-pitch DC coil machine, as these references are about PM machines?…”

Section: Reviewer's Commentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Winding Switching Control Strategy of a Consequent-Pole Ferrite-PM Hybrid-Excited Machine for Electric Vehicle Application

et al. 2022

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“…As mentioned above, 8 parameters are required to be optimized in this study. If each parameter is examined with three levels, it requires 8 3 , which equals to 512 experiments using the full factorial method. That is an extremely large project.…”

Section: B Establishment Of Taguchi Orthogonal Arraymentioning

confidence: 99%

“…The phenomenon of biased flux can be traced to half a century ago in double salient permanent magnet (PM) machine [1] as well as the switching reluctance machine proposed afterwards [2]. However, this phenomenon has not drawn researchers' attention for a long time until the author in [3] presented a systematic study of BFM. By definition, BFM refers to the machine which has biased flux in armature coils [4].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a Pole-Changing Biased Flux Machine Based on Sensitivity Analysis

Yuan

Niu

2019

2019 22nd International Conference on Electrical Machines and Systems (ICEMS)

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In this paper, a novel pole-changing biased flux machine is proposed. With special rotor pole and permanent magnetic pole design, this machine has pole-changing effect. By controlling the excitation current's polarity the pole number of this machine can switch back and forth between three pole pair and six pole pair. The armature winding is designed in concentrated structure to realize higher utilization ratio of flux linkage under both pole modes. To further improve the performance of the proposed machine, topology optimization is conducted. In order to verify the feasibility of this design, electromagnetic characteristics, including coil flux linkage distribution, air gap flux density and harmonics analysis are studied under finite element method.

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“…It has been proved that, the general AFM theory is valid for all electromagnetic machines, irrespective of DC or AC machines, salient or non-salient machines, sinusoidal or rectangular current driven machines, etc., with respect to both the qualitative and quantitative analyses associated with clear physical meanings. Further, the AFM theory has also been successfully used in the topology exploration of novel electrical machines [20], [21]. Hence, it is certain that an analytical model of the MSTPM machines can be built based on the general AFM theory.…”

mentioning

confidence: 99%

Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications

Zhang

Wang

Gerada

et al. 2020

IEEE Trans. Energy Convers.

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This paper proposes an analytical model of modular spoke-type permanent magnet (MSTPM) machines based on air-gap field modulation (AFM) theory. Firstly, a fundamental AFM model of open-circuit MSTPM machines is introduced. The open-circuit air-gap field of MSTPM machines is determined by three fundamental elements including the primitive magnetizing magnetomotive force (MMF) produced by permanent magnet (PM), and two modulators which consist of stator and rotor permeance. The analytical MMF excited by PM (PM-MMF) can be calculated by using magnetic circuit method, while the stator and rotor permeance models are developed based on relative permeance (RP) method. Thereafter, a general model is proposed to calculate the open-circuit back electromotive force (EMF) of MSTPM machines. Further, the winding inductance model is established on the basis of equivalent magnetic circuit method and RP model. Finally, the machine performance is predicted by the analytical model, and verified by both finite element analysis (FEA) and experimental results. Index Terms-Air-gap field modulation, AC machines, spoke-type PM machines, in-wheel traction.  NOMENCLATURE θ Air-gap position μ0 Permeability of vacuum ωRotor mechanical speed (rad/s)Relative rotor permeance at (position θ, moment t) Λr0Average relative rotor permeance Λ s0Average relative stator permeance Λr1 Amplitude of fundamental relative rotor permeance Λs(θ, t) Relative stator permeance at (position θ, moment t) Br(θ, t) Radial air-gap flux density at (position θ, moment t) B ho The h o th harmonic of air-gap flux density ec(t) Back-EMF of a single coil at moment t e kThe k th phase back-EMFThe harmonic of the k th phase back-EMF induced by the ho th harmonic of flux density 

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Topology Exploration and Torque Component Analysis of Double Stator Biased Flux Machines Based on Magnetic Field Modulation Mechanism

Cited by 8 publications

References 19 publications

A Novel Winding Switching Control Strategy of a Consequent-Pole Ferrite-PM Hybrid-Excited Machine for Electric Vehicle Application

A Novel Winding Switching Control Strategy of a Consequent-Pole Ferrite-PM Hybrid-Excited Machine for Electric Vehicle Application

Design Optimization of a Pole-Changing Biased Flux Machine Based on Sensitivity Analysis

Analytical Model of Modular Spoke-Type Permanent Magnet Machines for In-Wheel Traction Applications

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